Electric antenna



March 31, 1959 A. L. MUNZG ELECTRIC ANTENNA Filed May 25. 195e To ece/21erwww United States Patent() 2,880,416 ELECTRIC ANTENNA Arthur L. Munzig, Norwalk, Calif. Application May 2s, 19s6,seria1No. 'ss/,321 s claims. (ci. 343-720) by a; satisfactory television signal A.C. line.

Another object of the invention for tuningf such a matching;,device..

Still another object of thev invention is to provide an ecient television antenna energized by signal voltages existing in a house wiring system;

Briey stated my invention in one form, comprisesA a transmission line preferably `a 300 ohm twin lead line, connectable at one'end toa television receiver,.and connected at the otherV to a folded dipole. Means are provided to` capacitatively connect the dipole to the A.C. house mains and in some forms of the invention, to tune the dipole.

My invention may best be understood .by reference toa description of a preferred form of the invention as shown inthe drawings, in which:

Figure 1 is a perspective view (not to scale) of the outward aspects of a matching device of the present invention, shown in use.

Figure la is a rear perspective view casing to show prongs and grounding lug.

Figure 2 is a wiring diagram of the device of Figure l.

Figure 3 is a perspective diagram of a preferred receiver connection.

Referring iirst to Figures 1 and 1a, a television receiver 1 is provided with the usual power cord and plug is to provide means of the antenna provided with the. usual twin lead transmission line 5, usually a 300 ohm line. This line 5 which should be one-half wave or more long at the lowest frequency to be received, say from 6 to 10 feet long, enters a casing 10 preferably formed from insulating material. This ceptacle 3 (see Figure 1a).

On the top 14 of casing 10 are four holes 15a, 15b, 151:` and 15d.

The casing end of the twin lead'line 5 is connected 18 through respective registering casing holes 15a, 15b, 15c and 15d. Thus the phase of dipole 17 can be reversedwith respect to the transmission line 5.

Connection 25a, representing thecasing end of` one` 5 is connected through re-` lead of transmission line sistance-capacity filter network 30 through a common connection line 31`attached to th'e conduit 32 enclosing. This is done through casing takesy 'ad-- one to each side of the house power wires inhouse line 33.,

Filter network 30 is useful for keeping extraneous line noises' from reaching the,` receiver while permitting wire 41 attached to one side of the ceiver. Casing 10 is then plugged ceptacle 3.

It is preferred take off n b those on another receptacle, so the casing 10 shoudl be plugged in where the receiver performs best.

As some signal may be picked up directly by dipole 17 this signal should be in phase with the signal taken olf the house mains. The dipole should be placed in the holes 15a and 15b or 15C and 15d where the best signal is obtained.

a particular area.

lIt has been found that in a large number of instances pair of condensers 34 and'e a satisfactory television signal can be obtained from the use of the device herein described and claimed, where unsatisfactory conditions have prevented good signals from conventional indooror outdoor antennas.

While in order to comply with the statute, the invention has been described in language more or less specic as to structural features, it is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed comprises a preferred form of putting the invention into effect, and the invention is therefore claimed in any of its forms or modifications within the legitimate and valid scope of the appended claims.

What is claimed is:

1. An indoor television antenna comprising a casing, a pair of prongs sized to enter a standard 110 v. house wiring receptacle extending from the rear of said casing, a folded dipole mounted on top of said casing and a length of 300 ohm twin lead signal transmission line extended from said casing terminating outwardly in a television receiver connection, said dipole being connected across the inward end of said transmission line, and a capacitative connection between one side of said dipole and each of said prongs.

2. An indoor television antenna comprising a casing, a pair of prongs sized to enter a standard 110 v. house wiring receptacle extending from the rear of said casing, a folded dipole mounted on top of said casing and a length of 300 ohm twin lead signal transmission line extended from said casing terminating outwardly in a television receiver connection, said dipole being connected across the inward end of said transmission line, and a capacitative connection between one side of said dipole and each of said prongs, and means for changing the physical length of each pole of said folded dipole.

3. An indoor television antenna comprising a casing, a pair of prongs sized to enter a standard 110 v. house wiring receptacle extending from the rear of said casing, a folded dipole mounted on top of said casing and a length of 300 ohm twin lead signal transmission line extended from said casing terminating outwardly in a television receiver connection, said dipole being connected across the inward end of said transmission line, and a capacitative connection between one side of said dipole and each of said prongs, and means for changing the physical length of each pole of said folded dipole to tune said dipole to where the line terminating impedance equals 300 ohms at the desired reception frequency.

'assente 4. Apparatus in accordance with claim 1 wherein the dipole side of each of said capacitative connections is connected to a conduit enclosing the house wiring.

5. Apparatus in accordance with claim 1 wherein means are provided to connect the dipole side of each of said capacitative connections to a conduit contact making connection mounted on said casing.

6. Apparatus in accordance with claim 1 wherein means are provided to connect one lead of the receiver end of said transmission line to the receiver chassis ground.

7. Apparatus in accordance with claim 1 wherein said casing contains two pairs of adjacent parallel receptacle contacts in the top thereof cross-wired across said transmission line inward end, and wherein said dipole has two projecting contact pins at the feed points thereof which mate with each pair of said receptacle contacts, whereby changing the dipole mounting from one pair of receptacle contacts to the adjacent pair reverses the phase of said dipole with respect to said line and thus with respect to said capacitative connection.

8. Means for matching a radio receiver to alternating current power mains to obtain a radio signal therefrom comprising a capacitative connection to each side of said mains, said connections having a common connection, a 300 ohrn transmission line connected at one end to said receiver, one side of the other end of said line being connected to said common connection; an impedance matching device, the other side of said other end of said line being connected to said common connection throughl said impedance matching device, and a direct conducting connection from said common connection to a conduit enclosing said alternating current power mains. v

References Cited in the file of this patent UNITED STATES PATENTS 

